Quote Originally Posted by Richard Lane


Does anyone think that Canon could come out with a 1.7X extender (like Nikon) that would allow the 500mm f/4 to become an 840mm @ f/7.1 that would be able to AF, or is it too late for that?




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Never-mind, I just answered my own question. The 1D X won't AF with f/8 max lenses, but I also just read that it won't AF with apertures smaller than f/5.6, which would also disqualify f/6.3 and f/7.1.





Rich
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